BEIRUT (Reuters) - Syrian refugees fled on Friday from camps located in an area of the Lebanese-Syrian border being targeted in an offensive by Hezbollah and the Syrian army, and the Lebanese army is facilitating their passage, a Lebanese security source said.

It was not clear how many refugees had fled the camps in the Juroud Arsal area, the source said. Thousands of Syrian refugees live in the area, which is outside the Lebanese town of Arsal and straddles the Lebanese-Syrian border.

"The army is facilitating the passage of the displaced with supervision from U.N. delegates," the source said.